Concurrent performances: stimulus-control gradients during schedules of signalled and unsignalled concurrent reinforcement

On one key, pigeons' pecks were reinforced according to a variable-interval schedule in the presence of vertical lines, and were not reinforced in the presence of oblique lines. On a second key, pecks were reinforced according to a variable-interval schedule in the presence of blue, according to a signalled variable-interval schedule in the presence of red, and were not reinforced in the presence of white. Subsequently, during extinction, stimulus-control gradients were obtained by presenting eight different line orientations on the first key concurrent with each of the three colors on the second key. On the first key, line-orientation gradients tended to be lower, narrower, and less shifted in peak or area when the second-key stimulus was blue or red, the stimuli respectively correlated with unsignalled and signalled reinforcement, than when it was white, the stimulus correlated with extinction. Thus, the effect on first-key line-orientation gradients depended on second-key stimuli correlated with concurrent reinforcement, whether or not these stimuli were also correlated with concurrent responding. As a function of first-key line orientation, an inverted gradient was obtained on the second key during blue; during both red and white, rates of pecking on the second key were near zero.     

Tactical contingencies in the experimental analysis of reinforcement and operant classes

In his “Tactics of Scientific Research” (1960), his work on avoidance, his discovery of equivalence classes and his cautions on applications of coercion, Murray Sidman created high standards for behavior analytic research. I illustrate his influence in the context of three examples he might have characterized as pilot studies. Each examined trial N+1 response probabilities depending on whether trial N responding had produced a reinforcer. Differentially reinforced interresponse times, keys pecked in arbitrary matching, and two-key response sequences provided no robust evidence that reinforcing some response property on trial N raises the probability of responding with that property on trial N+1. These negative findings shed light on the nature of operant classes and on the relation of reinforcers to the responses that produced them. Through selection, reinforcers create operant classes and engender variations of the responses within those classes; operant classes are held together by common contingencies. Sidman extended our understanding of operant classes by expanding them to include equivalence relations.     

Italian Adagio: Every Law has Its Loophole

Science and Engineering Ethics - The Italian law of December 2010 establishes new criteria and parameters for the evaluation of faculty members. The parameters are represented by the number of...     

The Journal of the Experimental Analysis of Behavior at zero, fifty, and one hundred

The experimental content areas represented in JEAB in its first volume (1958) and 50 years later in Volume 87 are in many ways similar with regard to research on schedules of reinforcement, research with human subjects, and several other topics. Experimental analysis has not been displaced by quantitative analysis. Much less research on aversive control has been published in recent than in earlier years. Wishes for progress in the next 50 years include experiments on verbal behavior, the sources of novel behavior, and observing responses based on stimuli correlated with escape or avoidance.     

Using computers to teach behavior analysis

When it is impractical to provide behavior analysis students with extensive laboratory experience using real organisms, computers can provide effective demonstrations, simulations, and experiments. Furthermore, such computer programs can establish contingency-shaped behavior even in lecture classes, which usually are limited to establishing rule-governed behavior. We describe the development of computerized shaping simulations and the development of software that teaches students to discriminate among reinforcement schedules on the basis of cumulative records.     

Problematic internet use and academic achievement: a focus on interpersonal behaviours and academic engagement

In accordance with the Self-Determination Theory, the interpersonal behavior of others can support or thwart the basic psychological needs and influence the well-being of students. Furthermore, several studies have shown that problematic internet use has a negative influence on the academic field. However, no studies have investigated the impact of need-supportive and need-thwarting interpersonal behaviors (using the SDT theoretical framework) on internet addiction, academic engagement, and academic achievement. For this reason, the main purpose of this study is to investigate the relationship between students’ perceptions of others’ behaviors that supported or thwarted their basic psychological needs, internet addiction, and academic engagement and the impact on academic achievement through two studies. In the first study, 889 students (age: M?=?20.26, SD?=?3.16), were used to investigate the dimensionality of the Italian version of the Interpersonal Behaviour Questionnaire (IBQ) and the reliability, convergent and concurrent validity. In the second study, 515 students (age: M?=?20.26, SD?=?3.16) were tested to investigate the mediating role of problematic internet use on the relationship between students’ perceptions of others’ behaviors that supported or thwarted their basic psychological needs and academic engagement and the impact on academic achievement. The results of the first study suggested that the Italian version of the IBQ shows good psychometric characteristics in the Italian context. The results of the second study confirmed the mediating role of problematic internet use and academic engagement as mediators between students’ perceptions of need-thwarting interpersonal behaviors and academic achievement.